Chair arm



FIG. 1 is a perspective view showing the top, left side and front of a chair arm which forms my new design, the broken lines being for illustrative purposes only and forming no part of my design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a chair arm, as shown and described. 